20805384 has 32 divisors (see below), whose sum is σ = 52367040. Its totient is φ = 6888000.

The previous prime is 20805377. The next prime is 20805397. The reversal of 20805384 is 48350802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 754 + ... + 6494.

It is an arithmetic number, because the mean of its divisors is an integer number (1636470).

Almost surely, 2^20805384 is an apocalyptic number.

20805384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20805384 is an abundant number, since it is smaller than the sum of its proper divisors (31561656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20805384 is a wasteful number, since it uses less digits than its factorization.

20805384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5901 (or 5897 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20805384 is about 4561.2919222519. The cubic root of 20805384 is about 275.0375001203.

The spelling of 20805384 in words is "twenty million, eight hundred five thousand, three hundred eighty-four".